Well, it's three weeks later now, but there's no significant change with the plants ...
The buds are still pretty much the same size, no additional crystals on the flowerleaves ...
The thing is, the sunny days are pretty much over and it's about a constant 5°C outside, during the day. Plus it's often windy.
And I'm noticing the leaves are starting to fall off one by one. What to do now?